Beelzebub Part 1 contains episodes 1-30 of the anime directed by Nobuhiro Takamoto.

When you're a high school delinquent known as the invincible "Rampaging Demon Ogre," you've got to look tough and cool. For Tatsumi Oga, however, it's hard to pull off when he's got a baby peeing on his head!

Despite Tatsumi's best efforts, he can't seem to get rid of the kid. Ever since pulling a "big man" from a river, splitting him open, then finding the cute baby boy inside, the delinquent's been stuck playing caretaker. Sure, it's a little unusual. And maybe junior's got a bit of a habit of shocking people, you know, with lightning bolts. But it's not like the kid's a demon, right? Except that he is.

In fact baby "Beel" is the son of the Great Demon Lord himself, sent to Earth in order to destroy all of humanity, according to his demon nursemaid, Hilde. And it seems like Beel's chosen Tatsumi to be his daddy, all thanks to his perfectly demonic, evil behavior!